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B- E. BROCK. CONTINUOUS TUBE ROLLI NGMILL. APPLICATION FILED SEPT. 13, 1920. 1,420,239. Patented June 20, 1922.

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R. E. BROCK.

CONTINUOUS TlLBE ROLLING MILL. APPLICATION FILED SEPT. I3, 1920.

1,420,239. I Patented June 20, 1922. Y

-3 SHEETS-SHEET 2.

Swim Hot E/c/meo 6 C R. E. BROCK.

CONTINUOUS TUBE ROLLING MILL.

APPLICATION map SEPT. 13, 1920.

Patented J1me 20, 1922.

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1; 5; Be t C RICHARD E. BROOK, OF

PATENT OFFICE.

CANTON, 031e,; Assrenon ro-THE woonann MACHINE COMPANY, 0's w'oosrna, onro.

Q CONTINUOUS TUBE ROLLING MILL.

Specification of Letters Patent. Pafientcd June 20, 1922,

Application filed September 13,1820. Serial No.4.09822.

' To all whom it may concern:

Be it known that I, Rrormn-n E. BROOK, citizen of the United Fitates, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Continuous Tube Rolling Mills, of which the following is a specii'ication.

This invention relates generally to rolling mills, and primarily to that class known as continuous mills designed more specifically for manufacture of seamless tubing.

As Well known by those familiar with the manufacture of this class of tubing, the blank is passed through a series of alined sets oi rolls oi progressively decreasing pass diameter, known ordinarily as a continuous mill.

For reasons not necessary to explain here, inasmuch as they have absolutely no bearing upon my invention, the pass in these rolls is not quite round 'or cylindrical, being of slightly less diameter in aline transverse the rolls than longitudinally therewith,in other words, slightly oval or elliptical in the longitudinal plane of the rolls.

It is also necessary that the'heavier pressure in each succeeding set of rolls be ap plied at points in a plane substantially at right angles to the points of heavier pressure of the preceding set of rolls. In other words. the heavier pressure of each succeeding set of rolls should be applied at points substantially 90 degrees away from the points of such heavier pressure of the preceding set of rolls.

Furthermore, the passing of the blank through the rolls will, of course, cause elongation of the former with the result that the forward end of the blank will travel at a constantly increasing rate of speed and, obviously, each succeeding set of rolls must be driven correspondingly faster than the preceding set, the increase in actual practice being substantially tour per cent, and it is to this point or feature of the mill that my invention is more specifically directed and adapted.

WVith these and other objects in view, which will more clearly appear as the nature or' my invention is better. understood, the

same consists in the novel construction, combination and arrangement of parts as hereinafter more fully described, illustrated and claimed.

A preferred and-practical embodiment of my invention is shown in the accompanying drawings in Which:

' Figure l is a top plan view of a mill ineluding two units constructed in accordance with the present invention.

Figure 2 is an enlarged vertical sectional view illustrating the relative inclination of the individual roll standsor housings of opposite roll trains.

Figure 3 is a diagram illustrating the invention.

. Similar reference characters designate corresponding parts throughout the several fig ures of the drawings;

As already suggested, it is necessary in the rolling of seamless tubes that the heavier pressure of the slightly elliptical roll pass in each succeeding set of rolls be applied at points substantially 90 degrees away from points of such heavier pressure ofthe preceding set of rolls.

This makes it necessary to mount or house the alternate sets of rolls at substantially right angles to'each other, which I do by placing them at opposing angles of substantially 45 degrees. rather than horizontal and perpemlicular. See Eand E Figure 2.

These rolls are grouped in What may be termed mill units. designated upon the drawings as A, and B, respectively, each unit including eight sets of rolls comprising two roll trains (U and D in unit A, and C" and D in unit B) of tour rolls each, designated,

respectively. R R R and R in train C and R R. R and. B in train D unit A, and

R R R and R in train C and R R R and R in train D unit B. See Figure 3.

As the mill units A and B (and more if desired) are identical, a description of one will sniiice.

As already indicated. another object of my invention is to provide a simple and economical method oi progressively increasing the speed o'l each succeeding set of rolls to con'ipensate tor the constantly increasing rate oi speed of the forward end of the blank by reason of the elongation resulting from reduction in size.

Ordinarily. the roll mountings or housings oi such a'mill are set in alignment, and the necessary progressively increasing rate of speed is accomplished through the medium of a common driving shaft running along one side of the roll train and carrying driving spur gears of progressively increasing diameter, each meshing with the driven spur on its individual roll. This requires the use of a large number of different sized gears (sixteen in a 16 roll train illustrated in the present case) which adds very materially, of course, to the cost of manufacture, and one of the purposes of my invention is to avoid such additional costs.

To accomplish this, I use a separate or independent driving shaft for each train, des ignated S, S S and S for trains C, I), G and D, respectively. See Figure 3.

Each of said driving shafts carries a uniform set of driving spur gears of progressively increasing diameter, designated respectively 1, 3, 5 and 7 on shaft S, 2, 4, 6 and 8 on shaft S 9, 11, 13 and 15 on shaft S and 10, 12, 14 and 16 on shaft S As above stated, these sets of spur driving gears are of uniform diameter, that is to say, spurs 1, 2, 9 and 10 are of the same diameter, 3, 4, 11 and 12 are of the same diameter, 5, 6, 13 and 14: are of the same diameter, and 7, 8, 15 and 16 are of the same diameter.

lVhile not being theoretically correct, it will be sufliciently accurate for all purposes of description and illustration, to say that spur 3 is eight per cent larger than spur 1.; spur 5 is eight per cent larger than spur 3; and spur 7 is eight per cent larger than spur 5.

For the purpose of illustration we will say that shaft S is driven 100 revolutions per minute and shaft S 10 i revolutions per minute. Spurs 1, 3, 5 and 7 on shaft S will drive rollsR R ,v R and R respectively, While spurs 2, 4-, 6 and 8 on shaft S will drive rolls R R R and R respectively.

It is obvious that with this arrangement, spur 2 on shaft S which is of the same diameter as spur 1 on shaft S but travels four per cent faster, will drive roll R four per cent faster than roll R is driven; spur 3 on shaft S, which is eight per cent larger than spur 2 but travels four per cent slower, will drive roll R four per cent faster than roll R is driven; spur l on shaft S which is the same size as spur 3 but travels four per cent faster, will drive roll R four per cent faster than roll R is driven; spur 5 on shaft S, which is eight per cent larger than spur 4 but travels four per cent slower, will drive roll R four per cent faster than roll R driven; spur 6 on shaft S which is the same size as spur 5 but travels four per cent faster, will drive roll R four per cent faster than roll R is driven spur T on shaft S, which is eight per cent larger than spur 6 but travels four per cent slower, will drive roll R four per cent faster than roll It is driven while spur 8 on shaft S which is the same size as spur 7 but travels four per cent faster, will drive roll R four per cent faster than roll R is driven.

It will be apparent that in order to maintain this uniform progressively increasin rate of speed of the rolls throughout unit. roll If must be driven thirty-two per cent faster than roll R Consequently, as spur 9 on shaft S is of the same size as spur l on shaft S, it will be necessary to drive shaft S thirty-two per cent faster than shaft S is driven; while shaft S will be driven four per cent faster than shaft S for the same reason that shaft S is driven four per cent faster than shaft S in unit A.

I t is obvious that any number of mill units may be included in a completed mill, the driving shafts of each succeeding unit being driven proportionately faster than those of the ireceding unit, in order that they may do their work with the same uniform set of driving spurs.

The motor M, with its common driving shaft 3(7) carrying gears 28 and 29, furnishes the motive power for the four shafts S, S and S, the first being driven through gears 24, and 22, the second through gears 27, 26and 25, the third through gears 33, 32 and 31, and the fourth through gears 36, 35 and 34. See Figures 1 and 3.

I claim:

1.. In a continuous tube rolling mill, a

mill unit including a plurality of roll stands 7 carrying pass forming rolls, separate driv ing shafts respectively at opposite sides of the roll positions, gearing between each shaft and the rolls of alternate roll stands. the said gearing including a gear set for each roll stand, and the correspondin rear sets at opposite sides of the unit including gears of uniform size, and means for driving one of said driving shafts faster tha the other.

2. In a continuous tube rolling. mill, a mill unit including a plurality of roll stands carrying pass forming rolls, separate driving shafts respectively at opposite sides of the roll positions, a series of uniform gearing sets between each shaft and the rolls of alternate roll stands, the said gearing sets of each shaft having a progressive speed ratio, and means for driving one of said shafts faster than the other.

3. In a continuous tube rolling mill, a plurality of mill units each of which includes a plurality of roll stands carrying pass forming rolls, separate driving shafts respectively at opposite sides of the roll positions, gearing between each shaft and the rolls of alternate roll stands, said'gearing having a ratio to progressively increase the speed of successive rolls, and a common source of power having driving connections with the said driving shafts and providing means for operating the two shaftsof each mill unit at different speeds, and also driving the two shafts of one mill unit faster than the shafts of the immediately preceding unit.

4. In a continuous tube rolling mill, a series of mill units having the rolls of in dividual roll stands arranged in alinement to provide a continuous roll pass, opposite gear trains in each unit including opposite shafts, sets of driving gears of uniformly increasing diameter on each shaft and operatively connected with the rolls of alternate roll sets, a source of power common to the several mill units, and connections between the source of power and the shafts of each unit for rotating the shaft located alternately at opposite sides of the mill at uniformly increasing rates of speed.

5. In a continuous tube rolling mill, a plurality of mill units having the rolls of the individual roll stands arranged in aline ment to produce a continuous pass, and the said units including opposite shafts, corresponding sets of gears of uniformly increasing diameter carried by said shafts, and driving connections between the gears of the opposite shafts and the rolls of al tern-ate roll stands, means for rotating the opposite shafts at alternate sides of the mill at a uniformly advanced rate of speed, and a common source of power for actuating said means.

6. In a continuous tube rolling mill, a mill unit including a plurality of roll stands, rolls in each stand forming a roll pass, separate shafts at each side of the pass formed by the rolls of the roll stands, gears of progressively and uniformly in creasing diameter arranged on said shafts and located opposite alternate roll stands, driving connections between said rolls and said gears, means for driving one of said shafts at a faster rate of speed than the other, and a common source of power for actuating said means.

In testimony whereof I hereunto affix my signature in the presence of two Witnesses.

RICHARD E. BROCK.

Witnesses:

L. A. WoonARn, DOROTHY MoCoNNELL. 

